10CrMo9-10
2011年5月2日 by admin
【Abstract】 With the constant of the onshore and shallow water oil production, the whole world began to exploit the deep-sea oil. At the same time, the marine structures will face more severe and complicated load, such as the Internal Solitary Wave. The Internal Solitary Wave have the characteristics of single wave, large amplitude, long period and great nonlinear characteristics. It contains vast amounts of energy and sometimes causes great destruction for deep-water structures.Since the interaction between Internal Solitary Wave and the marine structures is high nonlinear, especially for large aspect ratio of flexible components, such as the deep-sea risers, so the linear potential theory will not solve such a problem. In this paper, numerical internal solitary wave flume is established to solve the problem.On the basis of reviewing recent progress of the problem, the works in the thesis are presented as follow:First, based on the mKdV internal solitary wave theory and the RANS equation, with turbulence model and the volume of fluid (VOF) method, a numerical internal solitary waves flume is devel10CrMo9-10
oped which can generate waves by controlling the velocity of two velocity inlet boundary and absorb waves by use of numerical dissipation.Second, the load characteristics of the interaction between internal solitary waves and large aspect ratio riser were numerically simulated and analyzed by use of the proposed numerical flume. The characteristics of the dynamic load, the velocity and the pressure on the riser due to such an internal solitary wave were presented.Third, deformation and stress characteristics of the deep-sea riser due to the internal solitary waves were simulated and analyzed by use of the finite element method based on the thin shell model. Four, based on the modified Morison formula, combining the dynamic equation of the elastic beam where the effect of the internal flowing fluid is taken into account, a simplified engineering model for analyzing the coupling dynamic response of the riser by surface wave, internal solitary wave and internal flow is presented.The results show that internal solitary wave will give rise to large deformation and stress concentration. Therefore, the influence of internal solitary wave on the deep-sea risers can not be neglected in practical engineering.
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